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103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
3 weeks ago
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkSPHQuarticKernel.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkSPHQuarticKernel
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* @brief a quartic SPH interpolation kernel
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*
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*
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* vtkSPHQuarticKernel is an smooth particle hydrodynamics interpolation kernel as
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* described by D.J. Price. This is a quartic formulation.
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*
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* @warning
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* For more information see D.J. Price, Smoothed particle hydrodynamics and
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* magnetohydrodynamics, J. Comput. Phys. 231:759-794, 2012. Especially
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* equation 49.
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*
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* @par Acknowledgments:
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* The following work has been generously supported by Altair Engineering
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* and FluiDyna GmbH. Please contact Steve Cosgrove or Milos Stanic for
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* more information.
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*
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* @sa
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* vtkSPHKernel vtkSPHInterpolator
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*/
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#ifndef vtkSPHQuarticKernel_h
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#define vtkSPHQuarticKernel_h
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#include "vtkFiltersPointsModule.h" // For export macro
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#include "vtkSPHKernel.h"
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#include <algorithm> // For std::min()
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class vtkIdList;
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class vtkDoubleArray;
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class VTKFILTERSPOINTS_EXPORT vtkSPHQuarticKernel : public vtkSPHKernel
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{
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public:
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//@{
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/**
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* Standard methods for instantiation, obtaining type information, and printing.
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*/
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static vtkSPHQuarticKernel* New();
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vtkTypeMacro(vtkSPHQuarticKernel, vtkSPHKernel);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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//@}
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/**
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* Produce the computational parameters for the kernel. Invoke this method
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* after setting initial values like SpatialStep.
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*/
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void Initialize(vtkAbstractPointLocator* loc, vtkDataSet* ds, vtkPointData* pd) override;
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//@{
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/**
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* Compute weighting factor given a normalized distance from a sample point.
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*/
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double ComputeFunctionWeight(const double d) override
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{
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double tmp1 = 2.5 - std::min(d, 2.5);
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double tmp2 = 1.5 - std::min(d, 1.5);
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double tmp3 = 0.5 - std::min(d, 0.5);
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return (tmp1 * tmp1 * tmp1 * tmp1 - 5.0 * tmp2 * tmp2 * tmp2 * tmp2 +
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10.0 * tmp3 * tmp3 * tmp3 * tmp3);
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}
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//@}
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//@{
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/**
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* Compute weighting factor for derivative quantities given a normalized
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* distance from a sample point.
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*/
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double ComputeDerivWeight(const double d) override
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{
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double tmp1 = 2.5 - std::min(d, 2.5);
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double tmp2 = 1.5 - std::min(d, 1.5);
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double tmp3 = 0.5 - std::min(d, 0.5);
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return (-4.0 * tmp1 * tmp1 * tmp1 + 20.0 * tmp2 * tmp2 * tmp2 - 40.0 * tmp3 * tmp3 * tmp3);
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}
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//@}
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protected:
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vtkSPHQuarticKernel();
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~vtkSPHQuarticKernel() override;
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private:
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vtkSPHQuarticKernel(const vtkSPHQuarticKernel&) = delete;
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void operator=(const vtkSPHQuarticKernel&) = delete;
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};
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#endif
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